[physfs] Implicit declaration of function ‘alloca’

[Matthew Albrecht]

When building release 3.02 on Ubuntu 18.04 with GCC9 or Clang9 I
receive the following error:
 > undefined reference to `alloca'

The simplest fix I could find was including alloca.h on Linux systems, I
modified "physfs_internal.h" at line 42 to read:
#if defined(PHYSFS_PLATFORM_SOLARIS) || defined(PHYSFS_PLATFORM_LINUX)
#include <alloca.h>
#endif
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